WO2019069571A1

WO2019069571A1 - Terminal, base station, transmission method, and reception method

Info

Publication number: WO2019069571A1
Application number: PCT/JP2018/030936
Authority: WO
Inventors: 岩井　敬; 智史高田; 翔太郎眞木
Original assignee: パナソニックインテレクチュアルプロパティコーポレーションオブアメリカ
Priority date: 2017-10-06
Filing date: 2018-08-22
Publication date: 2019-04-11
Also published as: US20200280925A1; JPWO2019069571A1; JP7069195B2; US11191030B2

Abstract

Provided is a terminal wherein a transmission power control unit controls the transmission power for an uplink channel (PUSCH) using transmission power control information (TPC command) which indicates any one of a plurality of candidate values. A wireless transmission unit transmits the uplink channel at such transmission power. Instruction information is associated with at least one of the plurality of candidate values, such information being for resetting a control value (Closed loop correction value) used for closed loop control of the transmission power.

Description

Terminal, base station, transmission method and reception method

The present disclosure relates to a terminal, a base station, a transmission method, and a reception method.

In 5G standardization, a new radio access technology (NR: New Radio) not necessarily backward compatible with LTE / LTE-Advanced is being discussed in 3GPP.

In the discussion of the transmission power control (TPC: Transmission Power Control) method of a terminal for NR (sometimes called "UE (User Equipment)"), the transmission power control method of LTE (see, for example, Non-Patent Document 1) The function extension considering the beam transmission / reception (directional transmission / reception) for NR is considered on the basis of.

However, the method of transmission power control in NR has not been sufficiently studied.

One aspect of the present disclosure contributes to provision of a terminal and a communication method capable of appropriately performing transmission power control.

A terminal according to an aspect of the present disclosure transmits the uplink channel using the transmission power and a circuit that controls transmission power of the uplink channel using transmission power control information indicating any one of a plurality of candidate values. A transmitter is provided, and at least one of the plurality of candidate values is associated with instruction information for resetting a control value used for closed loop control of the transmission power.

A base station according to an aspect of the present disclosure is a circuit that generates transmission power control information indicating any one of a plurality of candidate values, which is used to control transmission power of an uplink channel, and transmitted using the transmission power. A receiver for receiving the uplink channel, and at least one of the plurality of candidate values is associated with instruction information for resetting a control value used for closed loop control of the transmission power.

A transmission method according to an aspect of the present disclosure controls transmission power of an uplink channel using transmission power control information indicating any one of a plurality of candidate values, and transmits the uplink channel using the transmission power. The instruction information for resetting the control value used for the closed loop control of the transmission power is associated with at least one of the plurality of candidate values.

A receiving method according to an aspect of the present disclosure generates transmission power control information indicating any one of a plurality of candidate values used to control transmission power of an uplink channel, and the uplink transmitted using the transmission power. A channel is received, and at least one of the plurality of candidate values is associated with instruction information for resetting a control value used for closed loop control of the transmission power.

Note that these general or specific aspects may be realized by a system, an apparatus, a method, an integrated circuit, a computer program, or a recording medium, and the system, an apparatus, a method, an integrated circuit, a computer program, and a recording medium It may be realized by any combination of

According to one aspect of the present disclosure, transmission power control can be appropriately performed.

Further advantages and effects of one aspect of the present disclosure are apparent from the specification and the drawings. Such advantages and / or effects may be provided by some embodiments and features described in the specification and drawings, respectively, but need to be all provided to obtain one or more identical features. There is no.

FIG. 1 shows an example of the TPC command table. FIG. 2 shows an example of the Closed loop correction value reset information. FIG. 3 shows a part of the configuration of the terminal according to the first embodiment. FIG. 4 shows a part of the configuration of the base station according to the first embodiment. FIG. 5 shows the configuration of the terminal according to the first embodiment. FIG. 6 shows the configuration of a base station according to the first embodiment. FIG. 7 shows an operation example of the terminal and base station according to the first embodiment. FIG. 8 shows an example of a TPC command table according to setting example 1 of the first embodiment. FIG. 9 shows an example of a TPC command table according to setting example 2 of the first embodiment. FIG. 10 shows an example of a TPC command table according to the second embodiment. FIG. 11 shows the configuration of a terminal according to the third embodiment. FIG. 12 shows the configuration of a base station according to the third embodiment. FIG. 13 shows an example of switching of the TPC command table according to the third embodiment. FIG. 14 shows an example of a TPC command table after BPL switching according to the third embodiment. FIG. 15 shows the configuration of a terminal according to the fourth embodiment. FIG. 16 shows the configuration of a base station according to the fourth embodiment. FIG. 17 shows an example of the TPC command table according to the fourth embodiment. FIG. 18 shows an example of a TPC command table according to the fourth embodiment.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

In LTE, the terminal performs transmission power control of the uplink channel for each CC (Carrier component). Formula (1) shows the definition formula of the transmission power of PUSCH (Physical Uplink Shared Channel) used by LTE (for example, refer nonpatent literature 1).
P _pusch (i) = min {Pcmax (i), 10 log 10 (M _pusch (i))
+ P _{o _ pu s ch} + α · PL + Δ _TF (i) + f _c (i)} (1)

In equation (1), i indicates subframe number (or slot number), P _PUSCH (i) indicates PUSCH transmission power at subframe number = i, Pcmax (i) maximum transmission of terminal at subframe number = i Power [dBm] is shown, M _pusch (i) is PUSCH transmission bandwidth [PRB] at subframe number = i, and _{Po_pusch} is _{previously obtained} from a base station (sometimes called “eNB” or “gNB”) The parameter value [dBm] to be set is indicated, PL indicates the path loss measured by the terminal [dB], and α indicates a weighting factor (preset value) indicating the compensation ratio of the path loss, and Δ _TF (i) indicates an offset [dB] depending on MCS (Modulation and Coding Scheme) of data to be transmitted in subframe number = i, and f _c (i) indicates a closed loop correction value in subframe number = i.

Here, the method of calculating the closed loop correction value f _c (i) differs depending on the TPC mode. There are "Accumulated mode" and "Absolute mode" in TPC mode, and the application mode is semi-statically set by RRC signaling for each terminal.

In the Accumulated mode, as shown in equation (2), a correction value δ _PUSCH [dB] indicated by a past TPC command (hereinafter sometimes referred to as TPC command information) (hereinafter referred to as “TPC command correction value” To calculate f _c (i). In Equation (2), K _PUSCH represents the reflection timing of the TPC command correction value.
f _c (i) = f _c (i-1) + δ _PUSCH (i-K _PUSCH ) (2)

In the Absolute mode, f _c (i) is calculated using the TPC command correction value as it is without accumulating the past TPC command correction value, as shown in equation (3).
f _c (i) = δ _PUSCH (i-K _PUSCH ) (3)

TPC Command Correction Value δ TPC command information that indicates _PUSCH is included in control information (DCI: Downlink Control Information), and is transmitted from the base station to the terminal using PDCCH (Physical Downlink Control Channel). The TPC command correction value δ _{PUSCH, c} (also referred to simply as “δ _PUSCH ”) associated with the TPC command information is defined, for example, as shown in FIG. 1 (see Non-Patent Document 1).

Further, in LTE, when the parameter _{Po_pusch} shown in the equation (1) is reset in the accumulated mode, the closed loop correction value is reset (set f _c (i) = 0). That is, in LTE, an indirect reset notification according to parameter reconfiguration is defined.

On the other hand, in NR, a transmission power equation of PUSCH shown in equation (4) is studied (see, for example, non-patent document 2).
P _pusch (i) = min {Pcmax (i), 10 log 10 (M _pusch (i)) + P _{o _ pusch} (j)
+ α (j) · PL (k) + Δ _TF (i) + f _c (i, l)} (4)

In equation (4), i indicates the slot number (or mini-slot number), j indicates the open loop parameter number, k indicates the RS (Reference Signal) resource number for path loss measurement, and l indicates the closed loop process Indicates a number.

Also, PL (k) indicates the path loss [dB] measured by the terminal using the RS resource number k. That is, the value of path loss changes according to the beam (directivity pattern) applied to the RS resource number k.

Also, P _{o — pu s} ((j) and α (j) are independent parameter values for each open loop parameter number #j. For example, a beam applied to PUSCH, a waveform (a cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM) or a discrete Fourier transform-spread OFDM (DFT)) of PUSCH, an applied numerology (subcarrier interval etc), or Depending on the service type (eMBB (Enhamced Mobile Broadband), URLLC (Ultra-Reliable and Low Latency Communications), etc.), different values are set to _{Po_pusch} (j) and α (j).

Further, f _c (i, l) is a closed loop correction value of the closed loop process number l. For example, f _c (i, l) has an independent value depending on the beam applied to PUSCH, Waveform, Numeric, service type, and the like.

As described above, in NR, the parameters used for PUSCH transmission power calculation change dynamically depending on the beam applied to PUSCH, Waveform, Numeric, service type, and the like.

In such PU PUSCH transmission power control, the closed loop correction value f _c (i, l) is reset according to the change of parameters associated with the PUSCH beam, waveform, etc., similarly to the PUSCH transmission power control of LTE. It is feared that the efficiency of the method (ie, the method of setting f _c (i, l) = 0) is poor and performance degradation may occur. Also, during the period until the transmission power control value converges to the optimum value after resetting the Closed loop correction value f _c (i, l), the system performance may be degraded due to a decrease in desired signal power or an increase in interference power. There is sex.

Therefore, in NR, it is necessary to consider an explicit reset notification method of the Closed loop correction value f _c (i, l).

For example, it is conceivable that the reset timing of the Closed loop correction value f _c (i, l) is indicated dynamically by the base station using DCI Signaling. Also, for example, in an environment where it is assumed that the optimum value of transmission power does not greatly change, such as beam switching in the same TRP (Transmission and Reception Point, transmission and reception point connected with a base station and an optical fiber). The station does not instruct the terminal to reset the Closed loop correction value f _c (i, l). On the other hand, in an environment where there is a possibility that the optimum value of the transmission power value may greatly change, such as beam switching between different TRPs, the base station instructs the terminal to reset the Closed loop correction value.

FIG. 2 shows a reset flag for Closed loop correction value reset information (DCI) as an example of a method of explicitly notifying reset of the Closed loop correction value f _c (i, l). However, as shown in FIG. 2, when the closed loop correction value reset flag is newly added, the amount of information of DCI is simply increased by 1 bit, and the overhead is increased.

Thus, the explicit reset notification method of the Closed loop correction value in NR has not been sufficiently studied. Thus, in one aspect of the present disclosure, a method for appropriately notifying reset of a Closed loop correction value will be described.

Embodiment 1
[Overview of communication system]
A communication system according to an embodiment of the present disclosure includes a terminal 100 and a base station 200.

FIG. 3 is a block diagram showing a configuration of part of the terminal 100 according to the embodiment of the present disclosure. In terminal 100 shown in FIG. 3, transmission power control section 105 uses the transmission power control information (TPC command information) indicating any one of a plurality of candidate values to select the transmission power of the uplink channel (for example, PUSCH). Control. The wireless transmission unit 108 transmits the uplink channel at the above transmission power.

FIG. 4 is a block diagram showing a configuration of part of the base station 200 according to the embodiment of the present disclosure. In base station 200 shown in FIG. 4, scheduling section 205 uses transmission power control information (TPC command information) indicating one of a plurality of candidate values used for transmission power control of the uplink channel (for example, PUSCH). Generate The wireless reception unit 202 receives the uplink channel transmitted by the transmission power.

Here, instruction information for resetting a control value (Closed loop correction value) used for closed loop control of transmission power is associated with at least one of the plurality of candidate values.

[Terminal configuration]
FIG. 5 is a block diagram showing a configuration of terminal 100 according to the present embodiment. Terminal 100 transmits PUSCH to base station 200 based on an instruction from base station 200.

In FIG. 5, the terminal 100 includes an antenna 101, a wireless reception unit 102, a demodulation / decoding unit 103, a TPC command control unit 104, a transmission power control unit 105, a data generation unit 106, and an encoding / modulation unit And a wireless transmission unit 108.

The wireless reception unit 102 performs reception processing such as down conversion and A / D conversion on the reception signal received via the antenna 101, and outputs the reception signal to the demodulation / decoding unit 103.

Demodulation / decoding section 103 demodulates and decodes the received signal input from radio receiving section 102, and based on the decoding result, PUSCH resource information destined for terminal 100 transmitted from base station 200, and transmission power information Extract Demodulation / decoding section 103 outputs the extracted information to transmission power control section 105 and data generation section 106.

As PUSCH resource information, for example, frequency resource information (for example, transmission bandwidth, transmission band position (PRB number or block number etc.), time resource information (for example, slot number for transmitting PUSCH, OFDM symbol number etc.), or , And the PUSCH, etc. are included.

In addition to the TPC command information, the transmission power information includes, for example, parameters used for calculation of PUSCH transmission power shown in equation (4).

In addition, it is not necessary to simultaneously notify all the PUSCH resource information or the transmission power information to the terminal 100. For example, part of transmission power information may be notified to the terminal 100 as cell common information or semi-static notification information. Also, a part of the transmission power information may be defined in specifications as system common information, for example, and may not be notified from the base station 200 to the terminal 100.

The TPC command control unit 104 holds an association (for example, a table (hereinafter, referred to as “TPC command table”) between TPC command information and the TPC command correction value δ _PUSCH and outputs the table to the transmission power control unit 105. The TPC command table may be notified from the base station 200 to the terminal 100, or may be defined in specifications. Note that details of the method of setting the TPC command table will be described later.

The transmission power control unit 105 calculates the transmission power of the PUSCH based on the PUSCH resource information and the transmission power information input from the demodulation / decoding unit 103. Specifically, the transmission power control unit 105 uses the parameters (Pcmax (i), M _pusch (i), P _{o _ pusch} (j), α (j) used in the transmission power calculation formula (for example, formula (4)). , PL (k), Δ _TF (i), f _c (i, l) etc.

Here, when the TPC mode is the Accumulated mode, the transmission power control unit 105 uses the TPC command correction value δ corresponding to the TPC command information notified this time to the past Closed loop correction value f _c (i−1, l). A Closed loop correction value f _c (i, l) at slot number i is calculated by accumulating _PUSCH . At this time, the transmission power control unit 105 refers to the TPC command table output from the TPC command control unit 104, and determines the TPC command correction value δ _PUSCH corresponding to the TPC command information. Then, transmission power control section 105 outputs information indicating the calculated transmission power of PUSCH to radio transmission section 108.

Data generation section 106 generates data to be transmitted by terminal 100 based on the information (for example, MCS instructed from base station 200, information bit size, etc.) input from demodulation / decoding section 103. Data generation section 106 outputs the generated transmission data to encoding / modulation section 107.

Encoding / modulation section 107 encodes and modulates the transmission data input from data generation section 106, and outputs the modulated data signal to radio transmission section 108.

The wireless transmission unit 108 performs D / A conversion and up-conversion on the signal input from the encoding / modulation unit 107, and the obtained wireless signal is transmitted to the antenna by the transmission power input from the transmission power control unit 105. It transmits to base station 200 from 101.

[Base station configuration]
FIG. 6 is a block diagram showing a configuration of base station 200 according to the present embodiment. Base station 200 performs PUSCH scheduling (including transmission power control) for terminal 100.

In FIG. 6, a base station 200 includes an antenna 201, a radio reception unit 202, a demodulation / decoding unit 203, a TPC command control unit 204, a scheduling unit 205, a control information generation unit 206, and an encoding / modulation unit. And a wireless transmission unit 208.

The wireless reception unit 202 performs reception processing such as down conversion and A / D conversion on the signal from the terminal 100 received via the antenna 201, and outputs the reception signal to the demodulation / decoding unit 203.

The demodulation / decoding unit 203 demodulates and decodes the received signal input from the wireless reception unit 202, and outputs the decoding result (presence or absence of reception error (reception OK or reception NG)) to the scheduling unit 205.

The TPC command control unit 204 holds a TPC command table indicating correspondence between TPC command information and TPC command correction value δ _PUSCH, and outputs the TPC command table to the scheduling unit 205. The TPC command table held by the TPC command control unit 204 is the same as the table held by the terminal 100 (TPC command control unit 104). The TPC command table may be notified from the base station 200 to the terminal 100, may be defined by specifications, and is uniquely associated between the terminal 100 and the base station 200. The details of the setting method of the TPC command table will be described later.

Scheduling section 205 is based on a reference signal (not shown) transmitted by a terminal (including terminal 100) accommodated in base station 200, and transmits to each terminal quality information (eg, received power or received SINR (Signal to Interference and SINR). Estimate the noise ratio). Then, based on the estimated quality information, scheduling section 205 performs scheduling (radio resource allocation, transmission power control, etc.) of the uplink channel including the PUSCH to the accommodating terminal. In addition, when the decoding result input from the demodulation / decoding unit 203 indicates reception NG, the scheduling unit 205 performs PUSCH retransmission control on the corresponding terminal.

Also, the scheduling unit 205 refers to the TPC command table input from the TPC command control unit 204, and determines (generates) TPC command information based on the difference value between the PUSCH target received power and the actual received power. . Specifically, the scheduling unit 205 selects from the TPC command table the TPC command correction value δ _PUSCH closest to the difference value between the target received power of PUSCH and the actual received power, and determines the corresponding TPC command information.

The scheduling unit 205 outputs the determined scheduling information (including TPC command information) to the control information generation unit 206.

Control information generation section 206 generates a control signal including scheduling information (including TPC command information) for notifying terminal 100 based on an instruction from scheduling section 205, and outputs the control signal to encoding / modulation section 207. .

The coding and modulation unit 207 codes and modulates the control signal input from the control information generation unit 206, and outputs the modulated signal to the wireless transmission unit 208.

The wireless transmission unit 208 performs transmission processing such as D / A conversion, up conversion, amplification, etc. on the signal input from the encoding / modulation unit 207, and transmits the radio signal obtained by the transmission processing from the antenna 201 to the terminal 100. Send to

[Operation of terminal 100 and base station 200]
The operations in terminal 100 and base station 200 having the above configuration will be described in detail.

FIG. 7 is a sequence diagram showing operations of the terminal 100 (FIG. 5) and the base station 200 (FIG. 6).

The base station 200 performs transmission power control on the terminal 100, and determines TPC command information used for transmission power control in the terminal 100 (ST101). For example, the base station 200 refers to a TPC command table to be described later, and performs TPC command information (candidate value) corresponding to instruction information for resetting the TPC command correction value δ _PUSCH or the Closed loop correction value f _c (i, l). Choose Then, base station 200 transmits, to terminal 100, transmission power information including PUSCH resource information and TPC command information determined in ST101 (ST102).

The terminal 100 determines the transmission power (for example, refer to Formula (4)) of PUSCH using the transmission power information (TPC command information) notified from the base station 200 in ST102 (ST103). Then, terminal 100 transmits PUSCH to base station 200 based on the PUSCH resource information received in ST 102 and the transmission power determined in ST 103 (ST 104). That is, base station 200 receives, from terminal 100, the PUSCH transmitted with the transmission power based on the TPC command information determined in ST101.

[TPC command table settings]
Next, the method of setting the TPC command table held by the TPC command control unit 104 of the terminal 100 and the TPC command control unit 204 of the base station 200 will be described in detail.

Here, transmission power control using a TPC command (a TPC command similar to LTE) is unnecessary at the timing for instructing a reset of the Closed loop correction value f _c (i, l). That is, notification of the TPC command correction value δ _PUSCH by TPC command information is unnecessary at the timing at which the reset of the Closed loop correction value f _c (i, l) is instructed.

Therefore, in the present embodiment, the TPC command information includes instruction information for resetting the Closed loop correction value f _c (i, l). That is, instruction information for resetting the Closed loop correction value f _c (i, l) is associated with at least one of the candidate values of the TPC command information. Also, among the candidate value of the TPC command information, Closed loop correction value f _c (i, l) to the candidate values other than the candidate value indication information associated Reset is, Closed loop correction value f _c (i, The TPC command correction value δ _PUSCH for correcting l) is associated with each other.

That is, when the terminal 100 is instructed to reset the Closed loop correction value f _c (i, l) by the TPC command information, the terminal 100 resets the Closed loop correction value f _c (i, l). On the other hand, when the transmission power control value (TPC command correction value δ _PUSCH ) is instructed by the TPC command information, the terminal 100 does not reset the Closed loop correction value f _c (i, l).

Hereinafter, setting examples 1 and 2 of the TPC command table will be described.

<Setting example 1: When TPC command information is 2 bits>
FIG. 8 shows an example of a TPC command table in the case where TPC command information is 2 bits (that is, the same as TPC command information of LTE) according to setting example 1.

In the TPC command table shown in FIG. 8, “1” of the candidate values 0 to 3 of TPC command information is associated with “Reset” of the Closed loop correction value f _c (i, l). There is. Further, in the TPC command table shown in FIG. 8, among the candidate values 0 to 3 of the TPC command information, for the candidate values (0, 2, 3) other than “1”, each value of the TPC command correction value δ _PUSCH (-1, 1, 3) are associated with each other.

The terminal 100 (transmission power control unit 105) resets the Closed loop correction value f _c (i, l) when the TPC command information notified from the base station 200 is “1”. On the other hand, when the TPC command information notified from base station 200 is other than “1”, terminal 100 does not reset Closed loop correction value f _c (i, l), and performs TPC command correction corresponding to TPC command information. The value δ _PUSCH is accumulated in the closed loop correction value f _c (i, l) in the past (calculation of equation (2) is performed), and transmission power of PUSCH is calculated (calculation of equation (4) is performed).

According to setting example 1, the closed loop correction value f _c (i, l) is reset to the base station without increasing the information amount of the TPC command information as compared to the TPC command information of LTE (for example, see FIG. 1). It is possible to instruct the terminal 100 from 200.

Note that TPC command information "1" shown in FIG. 8 can not indicate a control value that can be instructed in LTE (corresponding to TPC command correction value δ _PUSCH = 0 in the case of FIG. 8), and convergence of transmission power control The time may be long. However, as shown in FIG. 8, a reset instruction is assigned instead of TPC command correction value δ _PUSCH = 0, which has the smallest absolute value within the range of TPC command correction value δ _PUSCH = −1 to 3. It is possible to prevent the variation range (correction range) of the Closed loop correction value from being limited, and to prevent an increase in the convergence time of the transmission power control.

<Setting example 2: When TPC command information is 3 bits>
FIG. 9 shows an example of the TPC command table when TPC command information is 3 bits according to setting example 2. The 3-bit TPC command information has, for example, the same amount of information as in the case where the Closed loop correction value reset flag information (1 bit) shown in FIG. 2 is added to the TPC command information (2 bits) in LTE shown in FIG. .

In the TPC command table shown in FIG. 9, “0” of candidate values 0 to 7 of TPC command information is associated with “Reset” of Closed loop correction value f _c (i, l). There is. Further, in the TPC command table shown in FIG. 9, for candidate values (1 to 7) other than “0” among candidate values 0 to 7 of TPC command information, each value (− −) of TPC command correction value δ _PUSCH 5, -3, -1, 0, 1, 3, 5) are associated with each other.

The terminal 100 (transmission power control unit 105) resets the Closed loop correction value f _c (i, l) when the TPC command information notified from the base station 200 is “0”. On the other hand, when the TPC command information notified from base station 200 is other than “0”, terminal 100 does not reset Closed loop correction value f _c (i, l), and performs TPC command correction corresponding to TPC command information. The value δ _PUSCH is accumulated in the closed loop correction value f _c (i, l) in the past (calculation of equation (2) is performed), and transmission power of PUSCH is calculated (calculation of equation (4) is performed).

According to setting example 2, although the information amount of TPC command information increases by 1 bit as compared to LTE TPC command information (for example, see FIG. 1), TPC command correction value δ _PUSCH and Closed using TPC command information Both of the loop correction value f _c (i, l) can be instructed to be reset.

Also, for example, in order to notify both TPC command information and the reset of the Closed loop correction value, the TPC command information (2 bits) of LTE shown in FIG. 1 and the Closed loop correction value reset flag information (1 bit) shown in FIG. When used (3 bits in total), four TPC command correction values δ _PUSCH and closed loop correction value reset notification can be made. On the other hand, in the TPC command information (3 bits) shown in FIG. 9, the notification of the new TPC command correction value δ _PUSCH (-5, -3, 5 in the case of FIG. 9) not included in the LTE (FIG. 1) It becomes possible. That is, in FIG. 9, compared with FIG. 1 and FIG. 2, the number of TPC command correction values δ _{PUSCH which} can be notified increases without increasing the number of bits (3 bits) to be used. As a result, the transmission power control performance can be improved by expanding the correction range of the Closed loop correction value f _c (i, l) by the TPC command correction value δ _PUSCH while suppressing an increase in the overhead of control information, and optimum transmission It is possible to shorten the time to converge on the power.

The setting examples 1 and 2 have been described above.

Thus, in the present embodiment, the information instructing reset of Closed loop correction value f _c (i, l) is included in the TPC command information notified from base station 200 to terminal 100. Thereby, in the present embodiment, base station 200 can efficiently issue a dynamic reset instruction of Closed loop correction value f _c (i, l) to terminal 100. Further, in the present embodiment, a new TPC command correction value can be added in addition to the LTE TPC command information (TPC command correction value) using TPC command information. Thus, according to the present embodiment, it is possible to improve the performance of transmission power control while suppressing an increase in overhead of control information.

As described above, according to the present embodiment, transmission power control can be performed by appropriately notifying reset of the Closed loop correction value.

Second Embodiment
The terminal and base station according to the present embodiment have the same basic configuration as terminal 100 and base station 200 according to Embodiment 1, and will be described using FIG. 5 and FIG.

The present embodiment is different from the first embodiment in the operation (setting of TPC command table) of TPC command control section 104 of terminal 100 and TPC command control section 204 of base station 200.

FIG. 10 shows an example of the TPC command table according to the present embodiment.

The TPC command table shown in FIG. 10 includes TPC command correction values δ _PUSCH in each TPC command mode (absolute mode and accumulated mode). For example, in FIG. 10, each value (−1, 0, 1) of the TPC command correction value δ _{PUSCH in} the Absolute mode is associated with each of the candidate values 0 to 2 of the TPC command information. Further, in FIG. 10, each value (-3, -1, 0, 1, 3) of TPC command correction value δ _{PUSCH in} Accumulated mode is associated with each of candidate values 3 to 7 of TPC command information. ing.

Further, in FIG. 10, with respect to the candidate value “1” of TPC command information indicating the TPC command correction value δ _PUSCH = 0 in the Absolute mode, “Reset of Closed loop correction value f _c (i, l) in Accumulated mode (Reset) is associated.

The terminal 100 (transmission power control unit 105) calculates the transmission power of PUSCH based on control information (PUSCH resource information and transmission power information) notified from the base station 200. The terminal 100 obtains a parameter (for example, f _c (i, l)) used in the transmission power calculation formula (Formula (2) or Formula (3)) based on the control information as in the first embodiment.

For example, in the Accumulated mode, when the TPC command information notified from the base station 200 is any of 3 to 7, the terminal 100 does not reset the Closed loop correction value f _c (i, l), but the TPC command. the TPC command correction value [delta] _PUSCH corresponding to the information by accumulating the past Closed loop correction value f _c (i, l), to calculate a Closed loop correction value f _c (i, l) in the slot number i.

Also, in the accumulated mode, when the TPC command information notified from the base station 200 is 1, the terminal 100 resets the closed loop correction value f _c (i, l).

On the other hand, if the TPC command information notified from the base station 200 is any one of 0 to 2 in the Absolute mode, the terminal 100 uses the TPC command correction value δ _PUSCH corresponding to the TPC command information as it is, and uses the slot number. The Closed loop correction value f _c (i, l) at i is calculated.

That is, in the TPC command table shown in FIG. 10, TPC command information = 1 corresponds to both TPC command correction value δ _PUSCH = 0 dB in Absolute mode and reset of Closed loop correction value in Accumulated mode.

Here, resetting the closed loop correction value in the accumulated mode (f _c (i, l) = 0) corresponds to setting the TPC command correction value δ _PUSCH = 0 dB in the absolute mode. That is, in FIG. 10, the reset of the closed loop correction value is associated with the TPC command information identical to the TPC command correction value δ _PUSCH (= 0 dB) of the Absolute mode corresponding to the reset of the closed loop correction value.

Thus, in the present embodiment, the TPC command correction value corresponding to the Accumulated mode and the TPC command correction value corresponding to the Absolute mode are associated with each of the plurality of candidate values of the TPC command information. Further, the instruction information for resetting the Closed loop correction value is associated with a candidate value corresponding to any one of the TPC command correction values in the Absolute mode among a plurality of candidate values of the TPC command information. Specifically, the instruction for resetting the Closed loop correction value in the Accumulated mode and the instruction for setting the TPC command correction value δ _PUSCH = 0 dB (that is, f _c (i, l) = 0) in the Absolute mode are the same. Share TPC command information.

As a result, although the information amount of TPC command information increases by 1 bit as compared to LTE TPC command information (for example, see FIG. 1), TPC command correction value δ _PUSCH and Closed loop correction using TPC command information Both reset of the value f _c (i, l) can be indicated.

Further, as shown in FIG. 10, the reset instruction information for Closed loop correction value f _c (i, l) is, Closed loop correction value f _c (i, l) in the Accumulated mode reset instruction information of the Absolute Mode It is notified using the same TPC command information as the TPC command correction value. Thus, in the present embodiment, all the values of the TPC command correction value in the accumulated mode can be indicated.

Furthermore, in the present embodiment, the TPC command mode (Absolute mode and Accumulated mode) can be switched dynamically using TPC command information. For example, the terminal 100 may switch to the Absolute mode when TPC command information is 0 to 2, and may switch to the Accumulated mode when TPC command information is 3 to 7.

Also, for example, in order to notify both TPC command information and the reset of the Closed loop correction value, the TPC command information (2 bits) of LTE shown in FIG. 1 and the Closed loop correction value reset flag information (1 bit) shown in FIG. When used (3 bits in total), four TPC command correction values δ _PUSCH and closed loop correction value reset notification can be made. On the other hand, in TPC command information (3 bits) shown in FIG. 10, notification of a new TPC command correction value δ _PUSCH (-3 in the case of FIG. 10) which is not in LTE (FIG. 1) is possible. That is, in FIG. 10, compared with FIG. 1 and FIG. 2, the number of TPC command correction values δ _{PUSCH that} can be notified increases without increasing the number of bits used (3 bits). As a result, the transmission power control performance can be improved by expanding the correction range of the Closed loop correction value f _c (i, l) by the TPC command correction value δ _PUSCH while suppressing an increase in the overhead of control information, and optimum transmission It is possible to shorten the time to converge on the power.

In FIG. 10, instruction information for resetting the Closed loop correction value in the accumulated mode to TPC command information (1) corresponding to the value (δ _PUSCH = 0) having the smallest absolute value among the TPC command correction values in the absolute mode. Explained the case of However, the instruction information for resetting the Closed loop correction value in the Accumulated mode is not limited to δ _PUSCH = 0 in the Absolute mode, and may be associated with TPC command information (candidate value) corresponding to the TPC command correction value in the Absolute mode. . For example, when the terminal 100 is performing transmission power control in the accumulated mode and receives TPC command information corresponding to the reset instruction information, the terminal 100 sets the TPC command information as the TPC command correction value δ _{PUSCH in the} absolute mode _. Instead, it may be recognized as a reset instruction of the Closed loop correction value in the Accumulated mode.

Third Embodiment
In this embodiment, a method of setting a TPC command table in consideration of beamforming applied to NR will be described.

In NR, a pair of transmit beam and receive beam at the time of application of beamforming is called "BPL (Beam pair link)". That is, if either the transmit beam or the receive beam is changed, different BPL numbers will result. In addition, in order to simplify the control, it is conceivable that control of beamforming is performed in a unit called "BPL group" in which a plurality of BPLs are put together.

Here, immediately after BPL is switched for beamforming control, the path loss estimation error including the beam gain between BPLs or the interference level between BPLs may be significantly different compared to before BPL switching. . Therefore, immediately after BPL switching, transmission power control does not function properly, and a problem arises that the transmission signal does not reach the target SINR (Signal to Interference and Noise Ratio) or interference with other cells becomes large.

In addition, since the interference level for each beam fluctuates dynamically, just setting the quasi-static open loop control parameters (α (j), _{Po_pusch} (j), etc.) for each BPL is immediately after BPL switching. It is insufficient as a correction of quality error. Therefore, it is necessary to correct the quality error immediately after the BPL switching by the closed loop control by TPC command information (TPC command correction value) notified from the base station.

However, a difference of up to 20 dB is assumed for each beam gain (see, for example, Non-Patent Document 3). Therefore, in the step width of the TPC command correction value similar to LTE, the convergence time for correcting the quality error immediately after the BPL switching becomes long, and the desired signal in the period until the transmission power control value converges to the optimum value. A decrease in power or an increase in interfering power may degrade system performance.

Therefore, in the present embodiment, immediately after BPL switching, a TPC command table having a step width of a TPC command correction value different from the step width of a TPC command correction value used during normal times (a period other than the period immediately after BPL switching) is used. Do.

[Terminal configuration]
FIG. 11 is a block diagram showing a configuration of terminal 300 according to the present embodiment. In FIG. 11, the same components as those in Embodiment 1 (FIG. 5) are assigned the same reference numerals and descriptions thereof will be omitted. Specifically, in FIG. 11, the addition of the BPL switching determination unit 301 and the operation of the TPC command control unit 302 are different from those of the first embodiment.

The BPL switching determination unit 301 uses the beam discrimination information included in the control information input from the demodulation / decoding unit 103 to determine whether or not BPL switching has occurred. The beam discrimination information may be, for example, at least one of an SRI (SRS resource indicator), a CRI (CSI-RS resource indicator), a beam indicator, and the like. The beam discrimination information is not limited to the SRI, the CRI, and the beam indicator, and may be a parameter that can determine the presence or absence of BPL switching.

As a determination method of BPL switching, for example, the BPL switching determination unit 301 holds the beam discrimination information instructed last time from the base station 400 (described later), and holds the beam discrimination information newly notified from the base station 400, and It may be determined that BPL switching has occurred when different values are indicated by comparison with the beam discrimination information being performed.

The method of determining whether or not BPL switching has occurred is not limited to the method using the beam discrimination information, but may be a method using other information such as a transmission power parameter set. Also, the beam discrimination information does not have to be notified by downlink control information (for example, DCI). The partial information of the beam discrimination information may be notified to the terminal 300 as cell common information or semi-static notification information.

The BPL switching determination unit 301 outputs, to the TPC command control unit 302, BPL switching information indicating whether or not BPL switching has occurred.

The TPC command control unit 302 uses, as a TPC command table indicating correspondence between TPC command information and a TPC command correction value δ _PUSCH , a TPC command table (called “post BPL switching TPC command table”) used immediately after BPL switching, , TPL command table (referred to as "normal time TPC command table") used other than immediately after BPL switching is held. In other words, in the TPC command table, each of a plurality of candidate values of TPC command information is associated with two control values, a TPC command correction value used at normal time and a TPC command correction value used after BPL switching. .

The details of the TPC command table after BPL switching and the normal time TPC command table will be described later.

When the BPL switching information input from the BPL switching determination unit 301 indicates that the BPL switching has occurred, the TPC command control unit 302 outputs the information of the TPC command table after BPL switching to the transmission power control unit 105. On the other hand, when it is indicated that BPL switching is not occurring in the BPL switching information input from BPL switching determination unit 301, TPC command control unit 302 outputs the information of the TPC command table under normal conditions to transmission power control unit 105. Do.

[Base station configuration]
FIG. 12 is a block diagram showing a configuration of base station 400 according to the present embodiment. In FIG. 12, the same components as in the first embodiment (FIG. 6) will be assigned the same reference numerals and descriptions thereof will be omitted. Specifically, in FIG. 12, the addition of the BPL control unit 401 and the operation of the TPC command control unit 402 are different from those of the first embodiment.

The BPL control unit 401 measures the quality information of each terminal based on the reference signal (not shown) transmitted from the accommodation terminal, which is input from the demodulation / decoding unit 203, and BPL switching is performed based on the quality information. Determine if it is necessary. For example, the BPL control unit 401 determines that BPL switching is necessary when the quality information is inferior, and determines that BPL switching is not necessary when the quality information is satisfactory. The BPL control unit 401 outputs, to the TPC command control unit 402, BPL switching information indicating whether or not BPL switching is necessary.

Similar to the terminal 300 (TPC command control unit 302), the TPC command control unit 402 holds a TPC command table after BPL switching and a normal time TPC command table. When the BPL switching information input from the BPL control unit 401 indicates that the BPL switching is necessary, the TPC command control unit 402 outputs information of the TPC command table after BPL switching to the scheduling unit 205. On the other hand, when the BPL switching information input from the BPL control unit 401 indicates that the BPL switching is unnecessary, the TPC command control unit 402 outputs the information of the normal TPC command table to the scheduling unit 205.

Next, transmission power control (a method of setting a TPC command table) in terminal 300 and base station 400 will be described in detail.

For example, as shown in FIG. 13, terminal 300 (TPC command control unit 302) and base station 400 (TPC command control unit 402) count the number of elapsed slots (or elapsed time) from the timing when BPL switching occurs. It is determined whether the number of elapsed slots exceeds a threshold X. Then, the terminal 300 and the base station 400 switch the TPC command table to be used according to the determination result. Specifically, when the number of elapsed slots is within the threshold X, the terminal 300 and the base station 400 use the TPC command table after BPL switching (for example, see FIG. 14) and the number of elapsed slots is greater than the threshold X , Normal use TPC command table (see, for example, FIG. 9).

The threshold value X may be defined in a specification, or may be notified from the base station 400 to the terminal 300 by higher layer signaling or the like. Further, the elapsed time is not limited to the number of slots but may be the number of transmissions of PUSCH or the like.

Here, while the range of the TPC command correction value δ _PUSCH notified by TPC command information (0 to 7) in the normal TPC command table shown in FIG. 9 is −5 to 5 [dB], FIG. In the TPC command table after BPL switching shown in, the range of the TPC command correction value δ _PUSCH notified by the TPC command information (0 to 7) is −7 to 7 [dB].

That is, in the TPC command table (for example, FIGS. 9 and 14) according to the present embodiment, other than the candidate values (0 in FIGS. 9 and 14) associated with the instruction information instructing the reset of the closed loop correction value. TPC command correction value used at normal time and after BPL switching whose step width is wider than TPC command correction value used at normal time for every candidate value of (1 to 7 in FIGS. 9 and 14) TPC command correction values are associated with each other. Further, the step width (see FIG. 14) of the TPC command correction value used after the BPL switching is set wider than the step width of the TPC command correction value used at the normal time.

By this means, in the terminal 300 and the base station 400, immediately after BPL switching, transmission power control using the TPC command correction value δ _PUSCH with a wider step width than in normal time is performed. Therefore, the terminal 300 and the base station 400 can increase the step width for correcting the quality error immediately after the BPL switching in which there is a high possibility that the path loss estimation error including the beam gain between the BPLs or the interference level between the BPLs is largely different. The time until the transmission power control value converges to the optimum value can be shortened.

Therefore, according to the present embodiment, even when BPL switching occurs, it is possible to prevent the system performance from deteriorating due to the reduction of the desired signal power or the increase of the interference power.

Embodiment 4
In this embodiment, as in the third embodiment, a method of setting a TPC command table in consideration of beamforming applied to NR will be described.

In NR, it is considered that the applicable beamforming control differs depending on the terminal depending on the capability (antenna configuration, processing capability) of the terminal. For example, a terminal with low capability for beam control (for example, a terminal with a small number of antennas) has a wider beam width than a terminal with high capability for beam control (for example, a terminal with a large number of antennas). In this case, it is considered that the beam gain fluctuation due to the movement of the terminal or the influence of an obstacle around the terminal differs depending on the beam width set for the terminal. Specifically, as the beam width is smaller, the beam gain fluctuation may increase.

In addition, although variations in beam gain can be corrected by closed loop control, when terminals with different capabilities related to beam control use the same TPC command table, the accuracy for causing the closed loop correction value to follow the optimum value is the terminal It will be different every time. Therefore, depending on the terminal, the system performance may be degraded due to a decrease in desired signal power or an increase in interference power.

Therefore, in the present embodiment, the case where the TPC command table to be used is switched according to the capability of the terminal will be described.

[Terminal configuration]
FIG. 15 is a block diagram showing a configuration of terminal 500 according to the present embodiment. In FIG. 15, the same components as those in Embodiment 1 (FIG. 5) are assigned the same reference numerals and descriptions thereof will be omitted. Specifically, in FIG. 15, the addition of the UE capability setting unit 501 and the operation of the TPC command control unit 502 are different from those of the first embodiment.

The UE capability setting unit 501 holds UE capability information defined in the specification according to the antenna configuration, processing capability, and the like of the terminal 500. The UE capability setting unit 501 outputs UE capability information to the TPC command control unit 502.

The TPC command control unit 502 associates the TPC command information with the TPC command correction value δ _PUSCH based on UE capability information (for example, capability information (for example, beam width information related to beam control)) input from the UE capability setting unit 501. Switch the TPC command table showing

[Base station configuration]
FIG. 16 is a block diagram showing a configuration of base station 600 according to the present embodiment. In FIG. 16, the same components as those in Embodiment 1 (FIG. 6) are assigned the same reference numerals and descriptions thereof will be omitted. Specifically, in FIG. 16, the addition of the UE capability setting unit 601 and the operation of the TPC command control unit 602 are different from those of the first embodiment.

The UE capability setting unit 601 outputs, to the TPC command control unit 602, UE capability information notified from the accommodation terminal, which is input from the demodulation / decoding unit 203.

Similar to the terminal 500 (TPC command control unit 502), the TPC command control unit 602 switches the TPC command table used in transmission power control for the terminal 500 based on the UE capability information input from the UE capability setting unit 601. .

Next, transmission power control (a method of setting the TPC command table) in terminal 500 and base station 600 will be described in detail.

FIG. 17 shows an example of a TPC command table set for a terminal 500 that performs beamforming control with a narrow beam width, and FIG. 18 is a TPC command table set for a terminal 500 that performs beamforming control with a wide beam width. An example is shown.

While the range of the TPC command correction value δ _PUSCH notified by TPC command information (0 to 7) in the TPC command table shown in FIG. 17 is -6 to 6 [dB], the TPC command table shown in FIG. In this case, the range of the TPC command correction value δ _PUSCH notified by the TPC command information (0 to 7) is −3 to 3 [dB].

That is, in the TPC command table according to the present embodiment (FIGS. 17 and 18), candidates other than the candidate values (0 in FIGS. 17 and 18) associated with the instruction information instructing reset of the closed loop correction value. The TPC command correction value set for the terminal 500 using a narrow beam width and the TPC command correction value set for the terminal 500 using a wide beam width for each value (1 to 7 in FIGS. 17 and 18) Are associated. Also, the step width of the TPC command correction value (FIG. 17) set for the terminal 500 using a narrow beam width is set wider than the step width of the TPC command correction value set for the terminal 500 using a wide beam width. It is done.

By this means, terminal 500 and base station 600 transmit power control using TPC command correction value δ _PUSCH with a wider step width than terminal 500 with a narrower beam width than with terminal 500 with a narrower beam width. To be done. Therefore, for the terminal 500 and the base station 600, the transmission power control value converges to the optimum value by widening the step width for correcting the quality error with respect to the terminal 500 where the beam gain fluctuation is likely to be large. Time can be shortened.

On the other hand, in terminal 500 and base station 600, transmission power control using TPC command correction value δ _PUSCH with a narrower step width than terminal 500 with a wider beam width is performed for terminal 500 with a wider beam width. It will be. That is, the terminal 500 and the base station 600 prevent the step 500 for correcting the quality error from unnecessarily widening the terminal 500 with relatively small beam gain fluctuation, and make the transmission power control value accurate to the optimum value. It can be set well.

Thus, in the present embodiment, terminal 500 and base station 600 can appropriately select the TPC command correction value δ _PUSCH and perform transmission power control based on the UE capability information for each terminal 500. Thus, according to the present embodiment, transmission power control can be appropriately performed for each terminal 500 having different capabilities relating to beam control, and system performance is degraded due to a decrease in desired signal power or an increase in interference power. You can prevent.

The information used as the switching reference of the TPC command table is not limited to the beam width, and may be information related to the beam width.

For example, the TPC command table may be switched according to the number of beams set in the terminal 500. It is considered that the beam width becomes narrower as the number of beams set to the terminal 500 is larger.

Also, the TPC command table may be switched according to the reference signal type used for path loss calculation used for transmission power calculation. It is considered that the applied beam width of the reference signal CSI-RS is smaller than that of the SS (Synchronization Signal) block.

Also, the TPC command table may be switched according to the transmission carrier frequency. For example, in the millimeter wave band where the carrier frequency is 24 GHz or more, it is considered that the number of antennas is larger and the applied beam width is narrower than the carrier frequency less than 24 GHz.

As described above, even when the TPC command table is switched according to the number of beams, the type of reference signal used for path loss estimation, or the transmission carrier frequency, the same effect as that of the present embodiment can be obtained.

The embodiments of the present disclosure have been described above.

In addition, the above-mentioned "beam" may be defined as follows.
(1) Transmission directivity pattern of

terminals

100, 300, 500 (including analog beam forming)
(2) Reception directivity patterns of

base stations

200, 400, 600 (including analog beamforming)
(3) Combination of transmission directivity pattern of

terminals

100, 300, 500 and reception directivity pattern of

base stations

200, 400, 600 (BPL)
(4) Precoding Matrix Indicator (PMI)
(5) Codebook number

Also, although transmission power control of PUSCH has been described in the above embodiment, the target of transmission power control is not limited to PUSCH, and the present disclosure can be applied to transmission power control of an uplink channel using a closed loop correction value. For example, the present disclosure can be applied to transmission power control for SRS or PUCCH instead of PUSCH, and similar effects can be obtained.

The TPC command tables shown in FIGS. 8-10, 14, 17, and 18 are an example, and the number of candidate values of TPC command information (the number of bits), or TPC command correction associated with TPC command information. The values are not limited to the values shown in FIG. 8-10, FIG. 14, FIG. 17, and FIG.

Further, in addition to the explicit reset notification described in the above embodiment, an indirect reset notification may be combined according to reconfiguration of transmission power control parameters similar to LTE. That is, when the terminal includes instruction information for resetting the Closed loop correction value in the TPC command information included in the DCI, and when the transmission power control parameter is re-set from the base station by upper layer notification. This resets the Closed loop correction value. As a result, it is possible to reduce the overhead of control information because it is not necessary to notify reset by DCI after setting parameters.

The present disclosure can be implemented in software, hardware, or software in conjunction with hardware. Each functional block used in the description of the above embodiment is partially or entirely realized as an LSI which is an integrated circuit, and each process described in the above embodiment is partially or totally It may be controlled by one LSI or a combination of LSIs. The LSI may be configured from individual chips, or may be configured from one chip so as to include some or all of the functional blocks. The LSI may have data inputs and outputs. An LSI may be called an IC, a system LSI, a super LSI, or an ultra LSI depending on the degree of integration. The method of circuit integration is not limited to LSI's, and implementation using dedicated circuitry, general purpose processors, or dedicated processors is also possible. In addition, an FPGA (Field Programmable Gate Array) that can be programmed after LSI fabrication, or a reconfigurable processor that can reconfigure connection and setting of circuit cells in the LSI may be used. The present disclosure may be implemented as digital processing or analog processing. Furthermore, if integrated circuit technology comes out to replace LSI's as a result of the advancement of semiconductor technology or a derivative other technology, it is naturally also possible to carry out function block integration using this technology. The application of biotechnology etc. may be possible.

A terminal according to the present disclosure includes: a circuit that controls transmission power of an uplink channel using transmission power control information indicating any one of a plurality of candidate values; and a transmitter that transmits the uplink channel using the transmission power. The instruction information for resetting the control value used for the closed loop control of the transmission power is associated with at least one of the plurality of candidate values.

In the terminal of the present disclosure, among the plurality of candidate values, candidate values other than the candidate value associated with the instruction information are associated with correction values for correcting the control value.

In the terminal of the present disclosure, a first correction value and a second correction value having a step width wider than the first correction value are associated for each candidate value other than the candidate value associated with the instruction information. Be

In the terminal of the present disclosure, the first correction value is used within a predetermined period after switching of a beam set to the terminal.

In the terminal of the present disclosure, the first correction value is used when the beam width set to the terminal is narrow, and the second correction value is used when the beam width set to the terminal is wide Be done.

In the terminal of the present disclosure, a correction value for correcting the control value is associated with each of the plurality of candidate values, and the correction value calculates the control value by accumulating past values of the correction value. One of a first correction value corresponding to one mode and a second correction value corresponding to a second mode in which the control value is calculated without accumulating past values of the correction value, The instruction information is associated with the candidate value corresponding to any one of the second correction values.

In the terminal of the present disclosure, the instruction information is associated with the candidate value corresponding to the value with the smallest absolute value among the second correction values.

The base station of the present disclosure uses a circuit for generating transmission power control information indicating any one of a plurality of candidate values, which is used to control the transmission power of the uplink channel, and the uplink channel transmitted by the transmission power. A receiver is provided, and at least one of the plurality of candidate values is associated with instruction information for resetting a control value used for closed loop control of the transmission power.

The transmission method of the present disclosure controls transmission power of an uplink channel using transmission power control information indicating any one of a plurality of candidate values, transmits the uplink channel with the transmission power, and transmits the plurality of candidates. Instruction information for resetting a control value used for closed loop control of the transmission power is associated with at least one of the values.

The reception method of the present disclosure generates transmission power control information indicating any one of a plurality of candidate values used to control transmission power of an uplink channel, and receives the uplink channel transmitted by the transmission power. The instruction information for resetting the control value used for the closed loop control of the transmission power is associated with at least one of the plurality of candidate values.

One aspect of the present disclosure is useful for a mobile communication system.

100, 300, 500

Terminal

101, 201

Antenna

102, 202

Radio reception unit

103, 203 Demodulation /

decoding unit

104, 204, 302, 402, 502, 602 TPC command control unit 105 Transmission power control unit 106

Data generation unit

107, 207 Coding /

modulation unit

108, 208

Radio transmission unit

200, 400, 600 Base station 205 Scheduling unit 206 Control information generation unit 301 BPL switching determination unit 401

BPL control unit

501, 601 UE capability setting unit

Claims

A circuit for controlling transmission power of an uplink channel using transmission power control information indicating any one of a plurality of candidate values;
A transmitter for transmitting the uplink channel at the transmission power;
Equipped with
Instruction information for resetting a control value used for closed loop control of the transmission power is associated with at least one of the plurality of candidate values.
Terminal.
Among the plurality of candidate values, candidate values other than the candidate values associated with the instruction information are associated with correction values for correcting the control value, respectively.
The terminal according to claim 1.
A first correction value and a second correction value having a step width wider than the first correction value are associated with each candidate value other than the candidate value associated with the instruction information.
The terminal according to claim 2.
The first correction value is used within a predetermined period after switching of the beam set to the terminal.
The terminal according to claim 3.
The first correction value is used when the beam width set to the terminal is narrow, and the second correction value is used when the beam width set to the terminal is wide.
The terminal according to claim 3.
A correction value for correcting the control value is associated with each of the plurality of candidate values,
The correction value may be a first correction value corresponding to a first mode in which the control value is calculated by accumulating past values of the correction value, and the correction value may not accumulate the past value of the correction value. Any of the second correction values corresponding to the second mode for calculating the control value,
The instruction information is associated with the candidate value corresponding to any of the second correction values.
The terminal according to claim 1.
The instruction information is associated with the candidate value corresponding to the smallest absolute value of the second correction values.
The terminal according to claim 6.
A circuit for generating transmission power control information indicating any one of a plurality of candidate values used for control of transmission power of an uplink channel;
A receiver for receiving the uplink channel transmitted by the transmission power;
Equipped with
Instruction information for resetting a control value used for closed loop control of the transmission power is associated with at least one of the plurality of candidate values.
base station.
Control transmission power of the uplink channel using transmission power control information indicating any one of a plurality of candidate values,
Transmitting the uplink channel with the transmission power;
Instruction information for resetting a control value used for closed loop control of the transmission power is associated with at least one of the plurality of candidate values.
How to send
Generating transmission power control information indicating any one of a plurality of candidate values used for control of transmission power of the uplink channel;
Receiving the uplink channel transmitted with the transmission power;
Instruction information for resetting a control value used for closed loop control of the transmission power is associated with at least one of the plurality of candidate values.
Reception method.